Material Fact

Magnesita Refratários S.A. (“Company”), pursuant to the terms of Law no. 6,404/76 and Rule no. 358/02 of Comissão de Valores Mobiliários (“CVM”), hereby informs its shareholders and the market in general, in connection with the transaction disclosed in the Material Fact dated October 5, 2016, by which Alumina Holdings, LLC (“Alumina”), Rearden L. Holdings 3 S.À R.L. (“Rearden”) and RHI AG (“RHI”) signed an agreement with the purpose of combining the operations of RHI and the Company to create a leading company in refractory solutions (“Transaction”), and in addition to information disclosed in the Material Fact dated June 28, 2017:

On the date hereof, the Brazilian Antitrust Authority (“CADE”) has cleared the Transaction without any restrictions (effective within 15 days as of the publication of CADE’s decision, in accordance with the applicable law). For more details on CADE’s decision, please see https://sei.cade.gov.br/sei/publicacoes/controlador_publicacoes.php?acao=publicacao_visualizar&id_publicacao_legado=&id_documento=397897&id_orgao_publicacao=0

Therefore, upon the effectiveness of CADE’s decision, the Transaction will have received all the mandatory antitrust approvals. Nevertheless, the completion of the Transaction is still subject to other conditions precedent mentioned in the Material Fact dated October 5, 2016.

The Company will keep its shareholders and the market in general informed regarding the development of the Transaction.